NetBSD/sys/dev/isa/if_le.c

/*
 * LANCE Ethernet driver
 *
 * Copyright (c) 1994 Charles Hannum.
 *
 * Copyright (C) 1993, Paul Richards. This software may be used, modified,
 *   copied, distributed, and sold, in both source and binary form provided
 *   that the above copyright and these terms are retained. Under no
 *   circumstances is the author responsible for the proper functioning
 *   of this software, nor does the author assume any responsibility
 *   for damages incurred with its use.
 *
 *	$Id: if_le.c,v 1.6 1994/07/02 04:13:16 mycroft Exp $
 */

#include "bpfilter.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/device.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/netisr.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#endif

#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif

#if NBPFILTER > 0
#include <net/bpf.h>
#include <net/bpfdesc.h>
#endif

#include <vm/vm.h>

#include <machine/cpu.h>
#include <machine/pio.h>

#include <i386/isa/isavar.h>
#include <i386/isa/dmavar.h>
#include <i386/isa/icu.h>
#include <i386/isa/if_lereg.h>


#define	ETHER_MIN_LEN	64
#define	ETHER_MAX_LEN	1518
#define	ETHER_ADDR_LEN	6

char *card_type[] = {"unknown", "BICC Isolan", "NE2100", "DEPCA"};
char *chip_type[] = {"unknown", "Am7990 LANCE", "Am79960 PCnet-ISA"};


/*
 * Ethernet software status per interface.
 *
 * Each interface is referenced by a network interface structure,
 * arpcom.ac_if, which the routing code uses to locate the interface.
 * This structure contains the output queue for the interface, its address, ...
 */
struct le_softc {
	struct	device sc_dev;
	struct	intrhand sc_ih;

	struct	arpcom sc_arpcom;	/* Ethernet common part */
	u_short	sc_iobase;		/* IO base address of card */
	u_short	sc_rap, sc_rdp;
	int	sc_chip, sc_card;
	void	*sc_mem;
	struct	init_block *sc_init;	/* Lance initialisation block */
	struct	mds *sc_rd, *sc_td;
	u_char	*sc_rbuf, *sc_tbuf;
	int	sc_last_rd, sc_last_td;
	int	sc_no_td;
#ifdef LEDEBUG
	int	sc_debug;
#endif
};

int leintr __P((struct le_softc *));
int le_ioctl __P((struct ifnet *, int, caddr_t));
int le_start __P((struct ifnet *));
int le_watchdog __P((/* short */));
static inline void lewrcsr __P((/* struct le_softc *, u_short, u_short */));
static inline u_short lerdcsr __P((/* struct le_softc *, u_short */));
void le_init __P((struct le_softc *));
void init_mem __P((struct le_softc *));
void le_reset __P((struct le_softc *));
void le_stop __P((struct le_softc *));
void le_tint __P((struct le_softc *));
void le_rint __P((struct le_softc *));
void le_read __P((struct le_softc *, u_char *, int));
struct mbuf *le_get __P((u_char *, int, struct ifnet *));
#ifdef LEDEBUG
void recv_print __P((struct le_softc *, int));
void xmit_print __P((struct le_softc *, int));
#endif
void le_setladrf __P((struct arpcom *, u_long *));

int leprobe();
int depca_probe __P((struct le_softc *, struct isa_attach_args *));
int ne2100_probe __P((struct le_softc *, struct isa_attach_args *));
int bicc_probe __P((struct le_softc *, struct isa_attach_args *));
int lance_probe __P((struct le_softc *));
void leattach();

struct cfdriver lecd = {
	NULL, "le", leprobe, leattach, DV_IFNET, sizeof(struct le_softc)
};

static inline void
lewrcsr(sc, port, val)
	struct le_softc *sc;
	u_short port;
	u_short val;
{

	outw(sc->sc_rap, port);
	outw(sc->sc_rdp, val);
}

static inline u_short
lerdcsr(sc, port)
	struct le_softc *sc;
	u_short port;
{
	
	outw(sc->sc_rap, port);
	return inw(sc->sc_rdp);
} 

int
leprobe(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct le_softc *sc = (void *)self;
	struct isa_attach_args *ia = aux;

	if (bicc_probe(sc, ia))
		goto found;
	if (ne2100_probe(sc, ia))
		goto found;
	if (depca_probe(sc, ia))
		goto found;
	return 0;

found:
	/*
	 * XXX - hopefully have better way to get dma'able memory later,
	 * this code assumes that the physical memory address returned
	 * from malloc will be below 16Mb. The Lance's address registers
	 * are only 24 bits wide!
	 */
#define MAXMEM ((NRBUF + NTBUF) * (BUFSIZE + sizeof(struct mds)) + \
		sizeof(struct init_block))
	if (sc->sc_card == DEPCA) {
		u_char *mem;
		int i;

		mem = sc->sc_mem = ia->ia_maddr;
		/* XXX This is somewhat bogus. */
		if (ia->ia_msize < MAXMEM) {
			printf("%s: not enough memory configured\n",
			    sc->sc_dev.dv_xname);
			return 0;
		}

		for (i = 0; i < ia->ia_msize; i++)
			mem[i] = 0xff;
		for (i = 0; i < ia->ia_msize; i++)
			if (mem[i] != 0xff) {
				printf("%s: failed to clear memory\n",
				    sc->sc_dev.dv_xname);
				return 0;
			}

		for (i = 0; i < ia->ia_msize; i++)
			mem[i] = 0xaa;
		for (i = 0; i < ia->ia_msize; i++)
			if (mem[i] != 0xaa) {
				printf("%s: failed to clear memory\n",
				    sc->sc_dev.dv_xname);
				return 0;
			}

		for (i = 0; i < ia->ia_msize; i++)
			mem[i] = 0x55;
		for (i = 0; i < ia->ia_msize; i++)
			if (mem[i] != 0x55) {
				printf("%s: failed to clear memory\n",
				    sc->sc_dev.dv_xname);
				return 0;
			}

		for (i = 0; i < ia->ia_msize; i++)
			mem[i] = 0x00;
		for (i = 0; i < ia->ia_msize; i++)
			if (mem[i] != 0x00) {
				printf("%s: failed to clear memory\n",
				    sc->sc_dev.dv_xname);
				return 0;
			}
	} else {
		sc->sc_mem = malloc(MAXMEM, M_TEMP, M_NOWAIT);
		if (!sc->sc_mem) {
			printf("%s: couldn't allocate memory for card\n",
			    sc->sc_dev.dv_xname);
			return 0;
		}
	}

	return 1;
}

int
depca_probe(sc, ia)
	struct le_softc *sc;
	struct isa_attach_args *ia;
{
	u_short iobase = ia->ia_iobase;
	u_char x;
	int i;

	sc->sc_iobase = iobase;
	sc->sc_rap = iobase + DEPCA_RAP;
	sc->sc_rdp = iobase + DEPCA_RDP;
	sc->sc_card = DEPCA;

	if (!(sc->sc_chip = lance_probe(sc)))
		return 0;

	outb(iobase + DEPCA_CSR, DEPCA_CSR_DUM);

	/*
	 * Extract the physical MAC address from the ROM.
	 */
	for (i = 0; i < 32; i++)
		if (inb(iobase + DEPCA_ADP) == 0xff &&
		    inb(iobase + DEPCA_ADP) == 0x00 &&
		    inb(iobase + DEPCA_ADP) == 0x55 &&
		    inb(iobase + DEPCA_ADP) == 0xaa &&
		    inb(iobase + DEPCA_ADP) == 0xff &&
		    inb(iobase + DEPCA_ADP) == 0x00 &&
		    inb(iobase + DEPCA_ADP) == 0x55 &&
		    inb(iobase + DEPCA_ADP) == 0xaa)
			goto found;
	for (i = 0; i < 32; i++)
		if (inb(iobase + DEPCA_ADP + 1) == 0xff &&
		    inb(iobase + DEPCA_ADP + 1) == 0x00 &&
		    inb(iobase + DEPCA_ADP + 1) == 0x55 &&
		    inb(iobase + DEPCA_ADP + 1) == 0xaa &&
		    inb(iobase + DEPCA_ADP + 1) == 0xff &&
		    inb(iobase + DEPCA_ADP + 1) == 0x00 &&
		    inb(iobase + DEPCA_ADP + 1) == 0x55 &&
		    inb(iobase + DEPCA_ADP + 1) == 0xaa)
			goto found;
	printf("%s: address not found; data:", sc->sc_dev.dv_xname);
	for (i = 0; i < 32; i++)
		printf(" %02x", inb(iobase + DEPCA_ADP));
	for (i = 0; i < 32; i++)
		printf(" %02x", inb(iobase + DEPCA_ADP + 1));
	printf("\n");
	return 0;
found:
	for (i = 0; i < ETHER_ADDR_LEN; i++)
		sc->sc_arpcom.ac_enaddr[i] = inb(iobase + DEPCA_ADP);

	outb(iobase + DEPCA_CSR, DEPCA_CSR_NORMAL);

	ia->ia_iosize = 16;
	return 1;
}

int
ne2100_probe(sc, ia)
	struct le_softc *sc;
	struct isa_attach_args *ia;
{
	u_short iobase = ia->ia_iobase;
	int i;

	sc->sc_iobase = iobase;
	sc->sc_rap = iobase + NE2100_RAP;
	sc->sc_rdp = iobase + NE2100_RDP;
	sc->sc_card = NE2100;

	if (!(sc->sc_chip = lance_probe(sc)))
		return 0;

	/*
	 * Extract the physical MAC address from the ROM.
	 */
	for (i = 0; i < ETHER_ADDR_LEN; i++)
		sc->sc_arpcom.ac_enaddr[i] = inb(iobase + i);

	ia->ia_iosize = 24;
	return 1;
}

int
bicc_probe(sc, ia)
	struct le_softc *sc;
	struct isa_attach_args *ia;
{
	u_short iobase = ia->ia_iobase;
	int i;

	sc->sc_iobase = iobase;
	sc->sc_rap = iobase + BICC_RAP;
	sc->sc_rdp = iobase + BICC_RDP;
	sc->sc_card = BICC;

	if (!(sc->sc_chip = lance_probe(sc)))
		return 0;

	/*
	 * Extract the physical MAC address from the ROM.
	 */
	for (i = 0; i < ETHER_ADDR_LEN; i++)
		sc->sc_arpcom.ac_enaddr[i] = inb(iobase + (i * 2));

	ia->ia_iosize = 16;
	return 1;
}

/*
 * Determine which chip is present on the card.
 */
int
lance_probe(sc)
	struct le_softc *sc;
{
	int type;

	/* Stop the LANCE chip and put it in a known state. */
	lewrcsr(sc, 0, STOP);
	delay(100);

	if (lerdcsr(sc, 0) != STOP)
		return 0;

	/*
	 * The PCnet-ISA chip doesn't allow some bits to be set.
	 */
	lewrcsr(sc, 3, PROBE_MASK);

	switch (lerdcsr(sc, 3) & PROBE_MASK) {
	case LANCE_MASK:
		type = LANCE;
		break;
	case PCnet_ISA_MASK:
		type = PCnet_ISA;
		break;
	default:
		type = 0;
		break;
	}

	lewrcsr(sc, 3, sc->sc_card == DEPCA ? ACON : 0);
	return type;
}

/*
 * Interface exists: make available by filling in network interface
 * record.  System will initialize the interface when it is ready
 * to accept packets.  We get the ethernet address here.
 */
void
leattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct le_softc *sc = (void *)self;
	struct isa_attach_args *ia = aux;
	struct ifnet *ifp = &sc->sc_arpcom.ac_if;

	ifp->if_unit = sc->sc_dev.dv_unit;
	ifp->if_name = lecd.cd_name;
	ifp->if_output = ether_output;
	ifp->if_start = le_start;
	ifp->if_ioctl = le_ioctl;
	ifp->if_watchdog = le_watchdog;
	ifp->if_flags =
	    IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST;

	if (sc->sc_card != DEPCA)
		isa_dmacascade(ia->ia_drq);

	/* Attach the interface. */
	if_attach(ifp);
	ether_ifattach(ifp);

	printf(": address %s, type %s %s\n",
	    ether_sprintf(sc->sc_arpcom.ac_enaddr),
	    card_type[sc->sc_card], chip_type[sc->sc_chip]);

#if NBPFILTER > 0
	bpfattach(&sc->sc_arpcom.ac_if.if_bpf, ifp, DLT_EN10MB, sizeof(struct ether_header));
#endif

	sc->sc_ih.ih_fun = leintr;
	sc->sc_ih.ih_arg = sc;
	sc->sc_ih.ih_level = IPL_NET;
	intr_establish(ia->ia_irq, &sc->sc_ih);
}

void
le_reset(sc)
	struct le_softc *sc;
{

	log(LOG_NOTICE, "%s: reset\n", sc->sc_dev.dv_xname);
	le_init(sc);
}
 
int
le_watchdog(unit)
	short unit;
{
	struct le_softc *sc = lecd.cd_devs[unit];

	log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname);
	++sc->sc_arpcom.ac_if.if_oerrors;
	le_reset(sc);
}

#define	LANCE_ADDR(sc, a) \
	(sc->sc_card == DEPCA ?	((u_long)(a) - (u_long)sc->sc_mem) : kvtop(a))

/* Lance initialisation block set up. */
void
init_mem(sc)
	struct le_softc *sc;
{
	struct ifnet *ifp = &sc->sc_arpcom.ac_if;
	int i;
	void *mem;
	u_long a;

	/*
	 * At this point we assume that the memory allocated to the Lance is
	 * quadword aligned.  If it isn't then the initialisation is going
	 * fail later on.
	 */

	/* 
	 * Set up lance initialisation block.
	 */
	mem = sc->sc_mem;

	sc->sc_init = mem;
#if NBPFILTER > 0
	if (ifp->if_flags & IFF_PROMISC)
		sc->sc_init->mode = PROM;
	else
#endif
		sc->sc_init->mode = 0;
	for (i = 0; i < ETHER_ADDR_LEN; i++) 
		sc->sc_init->padr[i] = sc->sc_arpcom.ac_enaddr[i];
	le_setladrf(&sc->sc_arpcom, sc->sc_init->ladrf);
	mem += sizeof(struct init_block);

	sc->sc_rd = mem;
	a = LANCE_ADDR(sc, mem);
	sc->sc_init->rdra = a;
	sc->sc_init->rlen = ((a >> 16) & 0xff) | (RLEN << 13);
	mem += NRBUF * sizeof(struct mds);

	sc->sc_td = mem;
	a = LANCE_ADDR(sc, mem);
	sc->sc_init->tdra = a;
	sc->sc_init->tlen = ((a >> 16) & 0xff) | (TLEN << 13);
	mem += NTBUF * sizeof(struct mds);

	/* 
	 * Set up receive ring descriptors.
	 */
	sc->sc_rbuf = mem;
	for (i = 0; i < NRBUF; i++) {
		a = LANCE_ADDR(sc, mem);
		sc->sc_rd[i].addr = a;
		sc->sc_rd[i].flags = ((a >> 16) & 0xff) | OWN;
		sc->sc_rd[i].bcnt = -BUFSIZE;
		sc->sc_rd[i].mcnt = 0;
		mem += BUFSIZE;
	}

	/* 
	 * Set up transmit ring descriptors.
	 */
	sc->sc_tbuf = mem;
	for (i = 0; i < NTBUF; i++) {
		a = LANCE_ADDR(sc, mem);
		sc->sc_td[i].addr = a;
		sc->sc_td[i].flags= ((a >> 16) & 0xff);
		sc->sc_td[i].bcnt = 0xf000;
		sc->sc_td[i].mcnt = 0;
		mem += BUFSIZE;
	}
}

void
le_stop(sc)
	struct le_softc *sc;
{

	lewrcsr(sc, 0, STOP);
}

/*
 * Initialization of interface; set up initialization block
 * and transmit/receive descriptor rings.
 */
void
le_init(sc)
	struct le_softc *sc;
{
	struct ifnet *ifp = &sc->sc_arpcom.ac_if;
	int s;
	register i;
	u_long a;

	/* Address not known. */
 	if (!ifp->if_addrlist)
		return;

	s = splimp();

	/* 
	 * Lance must be stopped to access registers.
	 */
	le_stop(sc);

	sc->sc_last_rd = sc->sc_last_td = sc->sc_no_td = 0;

	/* Set up lance's memory area. */
	init_mem(sc);

	/* No byte swapping etc. */
	lewrcsr(sc, 3, sc->sc_card == DEPCA ? ACON : 0);

	/* Give lance the physical address of its init block. */
	a = LANCE_ADDR(sc, sc->sc_init);
	lewrcsr(sc, 1, a);
	lewrcsr(sc, 2, (a >> 16) & 0xff);

	/* OK, let's try and initialise the Lance. */
	lewrcsr(sc, 0, INIT);

	/* Wait for initialisation to finish. */
	for (i = 0; i < 1000; i++)
		if (lerdcsr(sc, 0) & IDON)
			break;

	if (lerdcsr(sc, 0) & IDON) {
		/* Start the lance. */
		lewrcsr(sc, 0, INEA | STRT | IDON);
		ifp->if_flags |= IFF_RUNNING;
		ifp->if_flags &= ~IFF_OACTIVE;
		le_start(ifp);
	} else 
		printf("%s: card failed to initialise\n", sc->sc_dev.dv_xname);
	
	(void) splx(s);
}

/*
 * Setup output on interface.
 * Get another datagram to send off of the interface queue, and map it to the
 * interface before starting the output.
 * Called only at splimp or interrupt level.
 */
int
le_start(ifp)
	struct ifnet *ifp;
{
	register struct le_softc *sc = lecd.cd_devs[ifp->if_unit];
	struct mbuf *m0, *m;
	u_char *buffer;
	int len;
	int i;
	struct mds *cdm;

	if ((sc->sc_arpcom.ac_if.if_flags ^ IFF_RUNNING) &
	    (IFF_RUNNING | IFF_OACTIVE))
		return;

outloop:
	if (sc->sc_no_td >= NTBUF) {
		sc->sc_arpcom.ac_if.if_flags |= IFF_OACTIVE;
#ifdef LEDEBUG
		if (sc->sc_debug)
			printf("no_td = %x, last_td = %x\n", sc->sc_no_td,
			    sc->sc_last_td);
#endif
		return;
	}

	cdm = &sc->sc_td[sc->sc_last_td];
#if 0 /* XXX redundant */
	if (cdm->flags & OWN)
		return;
#endif
	
	IF_DEQUEUE(&sc->sc_arpcom.ac_if.if_snd, m);
	if (!m)
		return;

	++sc->sc_no_td;

	/*
	 * Copy the mbuf chain into the transmit buffer.
	 */
	buffer = sc->sc_tbuf + (BUFSIZE * sc->sc_last_td);
	len = 0;
	for (m0 = m; m; m = m->m_next) {
		bcopy(mtod(m, caddr_t), buffer, m->m_len);
		buffer += m->m_len;
		len += m->m_len;
	}

#if NBPFILTER > 0
	if (sc->sc_arpcom.ac_if.if_bpf)
		bpf_mtap(sc->sc_arpcom.ac_if.if_bpf, m0);
#endif

	m_freem(m0);
	len = max(len, ETHER_MIN_LEN);

	/*
	 * Init transmit registers, and set transmit start flag.
	 */
	cdm->bcnt = -len;
	cdm->mcnt = 0;
	cdm->flags |= OWN | STP | ENP;

#ifdef LEDEBUG
	if (sc->sc_debug)
		xmit_print(sc, sc->sc_last_td);
#endif
		
	lewrcsr(sc, 0, INEA | TDMD);

	/* possible more packets */
	if (++sc->sc_last_td >= NTBUF)
		sc->sc_last_td = 0;
	goto outloop;
}


/*
 * Controller interrupt.
 */
int
leintr(sc)
	register struct le_softc *sc;
{
	u_short isr;

	isr = lerdcsr(sc, 0);
#ifdef LEDEBUG
	if (sc->sc_debug)
		printf("%s: leintr entering with isr=%04x\n",
		    sc->sc_dev.dv_xname, isr);
#endif
	if ((isr & INTR) == 0)
		return 0;

	if (sc->sc_card == DEPCA)
		outb(sc->sc_iobase + DEPCA_CSR, DEPCA_CSR_NORMAL|DEPCA_CSR_IM);

	do {
		lewrcsr(sc, 0,
		    isr & (INEA | BABL | MISS | MERR | RINT | TINT | IDON));
		if (isr & (BABL | CERR | MISS | MERR)) {
			if (isr & BABL){
				printf("%s: BABL\n", sc->sc_dev.dv_xname);
				sc->sc_arpcom.ac_if.if_oerrors++;
			}
#if 0
			if (isr & CERR) {
				printf("%s: CERR\n", sc->sc_dev.dv_xname);
				sc->sc_arpcom.ac_if.if_collisions++;
			}
#endif
			if (isr & MISS) {
				printf("%s: MISS\n", sc->sc_dev.dv_xname);
				sc->sc_arpcom.ac_if.if_ierrors++;
			}
			if (isr & MERR) {
				printf("%s: MERR\n", sc->sc_dev.dv_xname);
				le_reset(sc);
				goto out;
			}
		}

		if ((isr & RXON) == 0) {
			printf("%s: receiver disabled\n", sc->sc_dev.dv_xname);
			sc->sc_arpcom.ac_if.if_ierrors++;
			le_reset(sc);
			goto out;
		}
		if ((isr & TXON) == 0) {
			printf("%s: transmitter disabled\n", sc->sc_dev.dv_xname);
			sc->sc_arpcom.ac_if.if_oerrors++;
			le_reset(sc);
			goto out;
		}

		if (isr & RINT) {
			/* Reset watchdog timer. */
			sc->sc_arpcom.ac_if.if_timer = 0;
			le_rint(sc);
		}
		if (isr & TINT) {
			/* Reset watchdog timer. */
			sc->sc_arpcom.ac_if.if_timer = 0;
			le_tint(sc);
		}

		isr = lerdcsr(sc, 0);
	} while ((isr & INTR) != 0);

#ifdef LEDEBUG
	if (sc->sc_debug)
		printf("%s: leintr returning with isr=%04x\n",
		    sc->sc_dev.dv_xname, isr);
#endif

out:
	if (sc->sc_card == DEPCA)
		outb(sc->sc_iobase + DEPCA_CSR, DEPCA_CSR_NORMAL);
	return 1;
}

#define NEXTTDS \
	if (++tmd == NTBUF) tmd=0, cdm=sc->sc_td; else ++cdm
	
void
le_tint(sc) 
	struct le_softc *sc;
{
	register int tmd = (sc->sc_last_td - sc->sc_no_td + NTBUF) % NTBUF;
	struct mds *cdm = &sc->sc_td[tmd];

	if (cdm->flags & OWN) {
		/* Race condition with loop below. */
#ifdef LEDEBUG
		if (sc->sc_debug)
			printf("%s: extra tint\n", sc->sc_dev.dv_xname);
#endif
		return;
	}

	sc->sc_arpcom.ac_if.if_flags &= ~IFF_OACTIVE;

	do {
		if (sc->sc_no_td <= 0)
			break;
#ifdef LEDEBUG
		if (sc->sc_debug)
			printf("trans cdm = %x\n", cdm);
#endif
		sc->sc_arpcom.ac_if.if_opackets++;
		--sc->sc_no_td;
		if (cdm->flags & (TBUFF | UFLO | LCOL | LCAR | RTRY)) {
			if (cdm->flags & TBUFF)
				printf("%s: TBUFF\n", sc->sc_dev.dv_xname);
			if ((cdm->flags & (TBUFF | UFLO)) == UFLO)
				printf("%s: UFLO\n", sc->sc_dev.dv_xname);
			if (cdm->flags & UFLO) {
				le_reset(sc);
				return;
			}
#if 0
			if (cdm->flags & LCOL) {
				printf("%s: late collision\n", sc->sc_dev.dv_xname);
				sc->sc_arpcom.ac_if.if_collisions++;
			}
			if (cdm->flags & LCAR)
				printf("%s: lost carrier\n", sc->sc_dev.dv_xname);
			if (cdm->flags & RTRY) {
				printf("%s: excessive collisions, tdr %d\n",
				    sc->sc_dev.dv_xname, cdm->flags & 0x1ff);
				sc->sc_arpcom.ac_if.if_collisions++;
			}
#endif
		}
		NEXTTDS;
	} while ((cdm->flags & OWN) == 0);

	le_start(&sc->sc_arpcom.ac_if);
}

#define NEXTRDS \
	if (++rmd == NRBUF) rmd=0, cdm=sc->sc_rd; else ++cdm
	
/* only called from one place, so may as well integrate */
void
le_rint(sc)
	struct le_softc *sc;
{
	register int rmd = sc->sc_last_rd;
	struct mds *cdm = &sc->sc_rd[rmd];

	if (cdm->flags & OWN) {
		/* Race condition with loop below. */
#ifdef LEDEBUG
		if (sc->sc_debug)
			printf("%s: extra rint\n", sc->sc_dev.dv_xname);
#endif
		return;
	}

	/* Process all buffers with valid data. */
	do {
		if (cdm->flags & (FRAM | OFLO | CRC | RBUFF)) {
			if ((cdm->flags & (FRAM | OFLO | ENP)) == (FRAM | ENP))
				printf("%s: FRAM\n", sc->sc_dev.dv_xname);
			if ((cdm->flags & (OFLO | ENP)) == OFLO)
				printf("%s: OFLO\n", sc->sc_dev.dv_xname);
			if ((cdm->flags & (CRC | OFLO | ENP)) == (CRC | ENP))
				printf("%s: CRC\n", sc->sc_dev.dv_xname);
			if (cdm->flags & RBUFF)
				printf("%s: RBUFF\n", sc->sc_dev.dv_xname);
		} else if (cdm->flags & (STP | ENP) != (STP | ENP)) {
			do {
				cdm->mcnt = 0;
				cdm->flags |= OWN;	
				NEXTRDS;
			} while ((cdm->flags & (OWN | ERR | STP | ENP)) == 0);
			sc->sc_last_rd = rmd;
			printf("%s: chained buffer\n", sc->sc_dev.dv_xname);
			if ((cdm->flags & (OWN | ERR | STP | ENP)) != ENP) {
				le_reset(sc);
				return;
			}
		} else {
#ifdef LEDEBUG
			if (sc->sc_debug)
				recv_print(sc, sc->sc_last_rd);
#endif
			le_read(sc, sc->sc_rbuf + (BUFSIZE * rmd),
			    (int)cdm->mcnt);
			sc->sc_arpcom.ac_if.if_ipackets++;
		}
			
		cdm->mcnt = 0;
		cdm->flags |= OWN;
		NEXTRDS;
#ifdef LEDEBUG
		if (sc->sc_debug)
			printf("sc->sc_last_rd = %x, cdm = %x\n",
			    sc->sc_last_rd, cdm);
#endif
	} while ((cdm->flags & OWN) == 0);

	sc->sc_last_rd = rmd;
} /* le_rint */


/*
 * Pass a packet to the higher levels.
 */
void 
le_read(sc, buf, len)
	struct le_softc *sc;
	u_char *buf;
	int len;
{
	struct ether_header *eh;
	struct mbuf *m;

	eh = (struct ether_header *)buf;
	len -= sizeof(struct ether_header) + 4;
	if (len <= 0)
		return;

	/* Pull packet off interface. */
	m = le_get(buf, len, &sc->sc_arpcom.ac_if);
	if (m == 0)
		return;

#if NBPFILTER > 0
	/*
	 * Check if there's a BPF listener on this interface.
	 * If so, hand off the raw packet to bpf. 
	 */
	if (sc->sc_arpcom.ac_if.if_bpf) {
		bpf_mtap(sc->sc_arpcom.ac_if.if_bpf, m);

		/*
		 * Note that the interface cannot be in promiscuous mode if
		 * there are no BPF listeners.  And if we are in promiscuous
		 * mode, we have to check if this packet is really ours.
		 */
		if ((sc->sc_arpcom.ac_if.if_flags & IFF_PROMISC) &&
		    (eh->ether_dhost[0] & 1) == 0 && /* !mcast and !bcast */
		    bcmp(eh->ether_dhost, sc->sc_arpcom.ac_enaddr,
			    sizeof(eh->ether_dhost)) != 0) {
			m_freem(m);
			return;
		}
	}
#endif

	ether_input(&sc->sc_arpcom.ac_if, eh, m);
}

/*
 * Supporting routines
 */

/*
 * Pull data off an interface.
 * Len is length of data, with local net header stripped.
 * We copy the data into mbufs.  When full cluster sized units are present
 * we copy into clusters.
 */
struct mbuf *
le_get(buf, totlen, ifp)
	u_char *buf;
	int totlen;
	struct ifnet *ifp;
{
	struct mbuf *top, **mp, *m, *p;
	int len;
	register caddr_t cp = buf;
	char *epkt;

	buf += sizeof(struct ether_header);
	cp = buf;
	epkt = cp + totlen;

	MGETHDR(m, M_DONTWAIT, MT_DATA);
	if (m == 0)
		return 0;
	m->m_pkthdr.rcvif = ifp;
	m->m_pkthdr.len = totlen;
	m->m_len = MHLEN;
	top = 0;
	mp = &top;

	while (totlen > 0) {
		if (top) {
			MGET(m, M_DONTWAIT, MT_DATA);
			if (m == 0) {
				m_freem(top);
				return 0;
			}
			m->m_len = MLEN;
		}
		len = min(totlen, epkt - cp);
		if (len >= MINCLSIZE) {
			MCLGET(m, M_DONTWAIT);
			if (m->m_flags & M_EXT)
				m->m_len = len = min(len, MCLBYTES);
			else
				len = m->m_len;
		} else {
			/*
			 * Place initial small packet/header at end of mbuf.
			 */
			if (len < m->m_len) {
				if (top == 0 && len + max_linkhdr <= m->m_len)
					m->m_data += max_linkhdr;
				m->m_len = len;
			} else
				len = m->m_len;
		}
		bcopy(cp, mtod(m, caddr_t), (unsigned)len);
		cp += len;
		*mp = m;
		mp = &m->m_next;
		totlen -= len;
		if (cp == epkt)
			cp = buf;
	}

	return top;
}

/*
 * Process an ioctl request.
 */
int
le_ioctl(ifp, cmd, data)
	struct ifnet *ifp;
	int cmd;
	caddr_t data;
{
	struct le_softc *sc = lecd.cd_devs[ifp->if_unit];
	struct ifaddr *ifa = (struct ifaddr *)data;
	struct ifreq *ifr = (struct ifreq *)data;
	int s, error = 0;

	s = splimp();

	switch (cmd) {

	case SIOCSIFADDR:
		ifp->if_flags |= IFF_UP;

		switch (ifa->ifa_addr->sa_family) {
#ifdef INET
		case AF_INET:
			le_init(sc);	/* before arpwhohas */
			/*
			 * See if another station has *our* IP address.
			 * i.e.: There is an address conflict! If a
			 * conflict exists, a message is sent to the
			 * console.
			 */
			sc->sc_arpcom.ac_ipaddr = IA_SIN(ifa)->sin_addr;
			arpwhohas(&sc->sc_arpcom, &IA_SIN(ifa)->sin_addr);
			break;
#endif
#ifdef NS
		/* XXX - This code is probably wrong. */
		case AF_NS:
		    {
			register struct ns_addr *ina = &IA_SNS(ifa)->sns_addr;

			if (ns_nullhost(*ina))
				ina->x_host =
				    *(union ns_host *)(sc->sc_arpcom.ac_enaddr);
			else {
				/* 
				 *
				 */
				bcopy(ina->x_host.c_host,
				    sc->sc_arpcom.ac_enaddr,
				    sizeof(sc->sc_arpcom.ac_enaddr));
			}
			/* Set new address. */
			le_init(sc); 
			break;
		    }
#endif
		default:
			le_init(sc);
			break;
		}
		break;

	case SIOCSIFFLAGS:
		/*
		 * If interface is marked down and it is running, then stop it
		 */
		if ((ifp->if_flags & IFF_UP) == 0 &&
		    (ifp->if_flags & IFF_RUNNING) != 0) {
			/*
			 * If interface is marked down and it is running, then
			 * stop it.
			 */
			le_stop(sc);
			ifp->if_flags &= ~IFF_RUNNING;
		} else if ((ifp->if_flags & IFF_UP) != 0 &&
		    	   (ifp->if_flags & IFF_RUNNING) == 0) {
			/*
			 * If interface is marked up and it is stopped, then
			 * start it.
			 */
			le_init(sc);
		} else {
			/*
			 * Reset the interface to pick up changes in any other
			 * flags that affect hardware registers.
			 */
			/*le_stop(sc);*/
			le_init(sc);
		}
#ifdef LEDEBUG
		if (ifp->if_flags & IFF_DEBUG)
			sc->sc_debug = 1;
		else
			sc->sc_debug = 0;
#endif
		break;

	case SIOCADDMULTI:
	case SIOCDELMULTI:
		error = (cmd == SIOCADDMULTI) ?
		    ether_addmulti(ifr, &sc->sc_arpcom):
		    ether_delmulti(ifr, &sc->sc_arpcom);

		if (error == ENETRESET) {
			/*
			 * Multicast list has changed; set the hardware filter
			 * accordingly.
			 */
			le_init(sc);
			error = 0;
		}
		break;

	default:
		error = EINVAL;
	}
	(void) splx(s);
	return error;
}

#ifdef LEDEBUG
void
recv_print(sc, no)
	struct le_softc *sc;
	int no;
{
	struct mds *rmd;
	int i, printed = 0;
	u_short len;
	
	rmd = &sc->sc_rd[no];
	len = rmd->mcnt;
	printf("%s: receive buffer %d, len = %d\n", sc->sc_dev.dv_xname, no,
	    len);
	printf("%s: status %x\n", sc->sc_dev.dv_xname, lerdcsr(sc, 0));
	for (i = 0; i < len; i++) {
		if (!printed) {
			printed = 1;
			printf("%s: data: ", sc->sc_dev.dv_xname);
		}
		printf("%x ", *(sc->sc_rbuf + (BUFSIZE*no) + i));
	}
	if (printed)
		printf("\n");
}
		
void
xmit_print(sc, no)
	struct le_softc *sc;
	int no;
{
	struct mds *rmd;
	int i, printed=0;
	u_short len;
	
	rmd = &sc->sc_td[no];
	len = -rmd->bcnt;
	printf("%s: transmit buffer %d, len = %d\n", sc->sc_dev.dv_xname, no,
	    len);
	printf("%s: status %x\n", sc->sc_dev.dv_xname, lerdcsr(sc, 0));
	printf("%s: addr %x, flags %x, bcnt %x, mcnt %x\n",
	    sc->sc_dev.dv_xname, rmd->addr, rmd->flags, rmd->bcnt, rmd->mcnt);
	for (i = 0; i < len; i++)  {
		if (!printed) {
			printed = 1;
			printf("%s: data: ", sc->sc_dev.dv_xname);
		}
		printf("%x ", *(sc->sc_tbuf + (BUFSIZE*no) + i));
	}
	if (printed)
		printf("\n");
}
#endif /* LEDEBUG */

/*
 * Set up the logical address filter.
 */
void
le_setladrf(ac, af)
	struct arpcom *ac;
	u_long *af;
{
	struct ifnet *ifp = &ac->ac_if;
	struct ether_multi *enm;
	register u_char *cp, c;
	register u_long crc;
	register int i, len;
	struct ether_multistep step;

	/*
	 * Set up multicast address filter by passing all multicast addresses
	 * through a crc generator, and then using the high order 6 bits as an
	 * index into the 64 bit logical address filter.  The high order bit
	 * selects the word, while the rest of the bits select the bit within
	 * the word.
	 */

	if (ifp->if_flags & IFF_PROMISC) {
		ifp->if_flags |= IFF_ALLMULTI;
		af[0] = af[1] = 0xffffffff;
		return;
	}

	af[0] = af[1] = 0;
	ETHER_FIRST_MULTI(step, ac, enm);
	while (enm != NULL) {
		if (bcmp(enm->enm_addrlo, enm->enm_addrhi,
		    sizeof(enm->enm_addrlo)) != 0) {
			/*
			 * We must listen to a range of multicast addresses.
			 * For now, just accept all multicasts, rather than
			 * trying to set only those filter bits needed to match
			 * the range.  (At this time, the only use of address
			 * ranges is for IP multicast routing, for which the
			 * range is big enough to require all bits set.)
			 */
			ifp->if_flags |= IFF_ALLMULTI;
			af[0] = af[1] = 0xffffffff;
			return;
		}

		cp = enm->enm_addrlo;
		crc = 0xffffffff;
		for (len = sizeof(enm->enm_addrlo); --len >= 0;) {
			c = *cp++;
			for (i = 8; --i >= 0;) {
				if (((crc & 0x80000000) ? 1 : 0) ^ (c & 0x01)) {
					crc <<= 1;
					crc ^= 0x04c11db6 | 1;
				} else
					crc <<= 1;
				c >>= 1;
			}
		}
		/* Just want the 6 most significant bits. */
		crc >>= 26;

		/* Turn on the corresponding bit in the filter. */
		af[crc >> 5] |= 1 << ((crc & 0x1f) ^ 24);

		ETHER_NEXT_MULTI(step, enm);
	}
	ifp->if_flags &= ~IFF_ALLMULTI;
}